Vibration loudspeaker

Abstract

A vibration loudspeaker relates to the technical field of audio instruments and comprises a shell and a loudspeaker body, the shell is formed by jointing an upper half shell and a lower half shell, the upper half shell is provided with a plurality of pressure relief through holes, the lower half shell is provided with a plurality of tuning holes, and the lower half shell is provided with at least one piece of first tuning paper; the first tuning paper covers the tuning holes respectively; a fixed elastic piece is arranged in the shell, second tuning paper is attached to the upper surface of the fixed elastic piece, the fixed elastic piece divides an inner cavity of the shell into two cavities, one cavity is defined by the fixed elastic piece and the lower half shell and is a tuning cavity, and the other cavity is defined by the fixed elastic piece and the upper half shell and is a pressure relief cavity; the loudspeaker body is fixed at the lower end of the fixing elastic piece, a vibrating plate is arranged on the loudspeaker body, the fixing elastic piece and the second tuning paper are provided with via holes for the vibrating plate to penetrate through, and the vibrating plate penetrates through the via holes in the fixing elastic piece and the second tuning paper and then is fixedly connected with the upper half shell.

Description

Technical Field

[0001] The present invention relates to the technical field of audio equipment, and in particular to the technology of a vibration speaker. Background Art

[0002] A speaker is a transducer that converts electrical signals into sound signals. When the speaker is working, its diaphragm will vibrate and resonate with the surrounding air, thus producing sound. Speakers are usually used in conjunction with microphones. When a microphone is used in a small space, the sound emitted by the sound source is picked up by the pickup.

[0003] The sound waves are then transmitted to the speaker, which outputs the sound. However, after the sound waves output by the speaker are reflected by obstacles such as the human body, the product's own structure, and the wall, they will be picked up again by the microphone and then transmitted to the speaker by the microphone. After multiple cycles, howling will occur, affecting the user experience. Summary of the invention

[0004] In view of the defects existing in the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a vibration speaker which can effectively avoid howling.

[0005] In order to solve the above technical problems, the present invention provides a vibration speaker, comprising a housing and a speaker body.

[0006] The shell is formed by joining an upper shell and a lower shell, the upper shell is provided with a plurality of pressure relief holes, the lower shell is provided with a plurality of tuning holes, and the lower shell is provided with a first tuning paper covering each tuning hole;

[0007] The shell is provided with a fixed spring sheet, the upper surface of which is covered with a second tuning paper, and the fixed spring sheet divides the inner cavity of the shell into two chambers, one of which is formed by the fixed spring sheet and the lower shell, and is a tuning chamber, and the other is formed by the fixed spring sheet and the upper shell, and is a pressure relief chamber;

[0008] The speaker body is fixed to the lower end of the fixed spring sheet, a vibration plate is arranged on the speaker body, a through hole for the vibration plate to pass through is opened on the fixed spring sheet and the second tuning paper, and the vibration plate is fixedly connected to the upper shell after passing through the through holes on the fixed spring sheet and the second tuning paper.

[0009] Furthermore, the number of the first tuning papers is consistent with the number of the tuning holes, and each first tuning paper covers one tuning hole.

[0010] The vibration speaker provided by the present invention has a first tuning paper, a second tuning paper and a tuning cavity forming a damping space, which can reduce the amplitude of the howling resonance peak, and the pressure relief through hole can reduce the sound pressure generated in the inner cavity of the shell when the speaker vibrates, thereby reducing the amplitude of the howling resonance peak. With the coordinated cooperation of the first tuning paper, the second tuning paper and the pressure relief through hole, the vibration speaker can be effectively prevented from generating howling. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a structural exploded diagram of a vibration speaker according to an embodiment of the present invention;

[0012] Figure 2 is a front view cutaway view of a vibration speaker according to an embodiment of the present invention;

[0013] Figure 3 4 is an analog diagram of an equivalent circuit of a vibration speaker according to an embodiment of the present invention. DETAILED DESCRIPTION

[0014] The following is a further detailed description of an embodiment of the present invention in conjunction with the accompanying drawings, but this embodiment is not intended to limit the present invention. All similar structures and similar variations of the present invention should be included in the protection scope of the present invention. The commas in the present invention all represent the relationship of and.

[0015] like Figure 1-Figure 2 As shown, a vibration speaker provided by an embodiment of the present invention comprises a housing and a speaker body 2;

[0016] The housing is formed by joining an upper housing 11 and a lower housing 12. The upper housing 11 is provided with a plurality of pressure relief holes 111. The lower housing 12 is provided with a plurality of tuning holes 121. The lower housing 12 is provided with a first tuning paper 122 covering each tuning hole 121.

[0017] The housing is provided with a fixed spring sheet 3, the upper surface of which is covered with a second tuning paper 4. The fixed spring sheet 3 divides the inner cavity of the housing into two chambers, one of which is surrounded by the fixed spring sheet 3 and the lower half housing 12 and is the tuning chamber 5, and the other is surrounded by the fixed spring sheet 3 and the upper half housing 11 and is the pressure relief chamber 6.

[0018] The speaker body 2 is fixed to the lower end of the fixed spring piece 3, and a vibration plate 21 is provided on the speaker body 2. The fixed spring piece 3 and the second tuning paper 4 are provided with through holes for the vibration plate 21 to pass through. The vibration plate 21 passes through the through holes on the fixed spring piece 3 and the second tuning paper 4 and is fixedly connected to the upper half shell 11.

[0019] In an embodiment of the present invention, the number of the first tuning papers 122 is consistent with the number of the tuning holes 121, and each first tuning paper 122 covers one tuning hole 121. In other embodiments, the number of the first tuning papers may also be less than the number of the tuning holes. In this case, some first tuning papers are needed to cover multiple tuning holes at the same time to ensure that each tuning hole is covered by the first tuning paper.

[0020] In an embodiment of the present invention, the material of the upper shell 11 can be silicone, rubber, TPU, TPE, PVC, the material of the lower shell 12 can be PP, ABS, PC, POM, PVC, PTE, and the material of the fixing spring 3 can be stainless steel sheet, copper sheet, carbon fiber, rubber, cloth, titanium alloy.

[0021] The working principle of the embodiment of the present invention is as follows:

[0022] The dynamic equation for a vibrating loudspeaker is:

[0023] [M]u+[K]u=0

[0024]

[0025]

[0026]

[0027] Where [M] is the mass matrix of the vibration speaker, [K] is the stiffness matrix of the vibration speaker, is the displacement matrix of the relative displacement of the vibration speaker due to vibration relative to the original position, u is the relative displacement of the vibration speaker due to vibration relative to the original position, ω is the angular frequency of the vibration speaker when vibrating, f is the resonant frequency of the vibration wave output by the vibration speaker, e iωt is Euler's formula (e is a natural constant, i is an imaginary number, and t is time);

[0028] When the vibration speaker is working, the speaker body 2 receives the howling sound wave transmitted by the sound source and outputs the corresponding sound wave. The sound wave is transmitted to the upper shell 11 through the vibration plate 21, and is transmitted to the lower shell 12 through the fixed spring 3. According to the dynamic equation of the vibration speaker, the value of f is determined by the mass and stiffness of the vibration speaker. When designing a vibration speaker, the mass and stiffness of the shell and the fixed spring can be selected according to different needs, so that the value of f can reach the required target value.

[0029] The acoustic capacity of the speaker body 2 is defined as C m , the sound quality of the speaker body 2 is defined as M m , the acoustic resistance of the speaker body 2 is defined as R m ;

[0030] Define the acoustic capacity of tuning cavity 5 as C a1 The sum of the sound quality of each tuning hole 121 is defined as M a1 The sum of the acoustic resistances of the tuning holes 121 is defined as R a1 ;

[0031] The acoustic capacity of the pressure relief chamber 6 is defined as C a2 , the sound quality of the second tuning paper 4 is defined as M a2 , the acoustic resistance of the second tuning paper 4 is defined as R a2 ;

[0032] The pressure of the sound wave output by the speaker body 2 is defined as F:

[0033] F=P a ×S

[0034] Where P a is the sound pressure of the sound wave output by the speaker body 2, and S is the area of ​​the vibration plate 21;

[0035] According to the structure of the vibration speaker, it can be concluded Figure 3 The equivalent circuit analogy diagram of the vibration speaker shown in the figure and the acoustic capacitance C of the vibration speaker a , sound quality M a Harmonic resistance R a :

[0036] C a =C a1 +C a2

[0037]

[0038]

[0039] The acoustic impedance of a vibration speaker is:

[0040] Z a =R′ a +jX′ a

[0041]

[0042]

[0043]

[0044]

[0045] In the formula, Z a R' is the acoustic impedance of the sound wave output by the vibration speaker. ais the acoustic resistance of the sound waves output by the vibration speaker, jX' a V is the acoustic reactance of the sound waves output by the vibration speaker. a is the vibration amplitude of the sound wave output by the vibration speaker, f 12 is the center frequency of the sound wave output by the vibration speaker, ω 1 is the angular frequency of the lower half of the housing when it vibrates, ω 2 is the angular frequency of the first tuning paper when it vibrates.

[0046] The first tuning paper 122, the second tuning paper 4 and the tuning cavity 5 form a damping space. When the howling sound waves emitted by the vibration of the speaker body 2 are output outward through the tuning holes 121 and the first tuning papers 122, the tuning holes 121 and the first tuning papers 122 can reduce the amplitude of the resonance peak of the howling sound waves. When the speaker body 2 drives the vibration plate 21 to vibrate, sound pressure will be generated in the outer shell. Each pressure relief hole 111 can quickly release the air in the cavity, thereby reducing the sound pressure in the outer shell, thereby effectively avoiding the vibration speaker from generating howling.

Claims

1. A vibration speaker, comprising a housing and a speaker body (2), characterized in that: The shell is formed by joining an upper shell (11) and a lower shell (12); the upper shell (11) is provided with a plurality of pressure relief holes (111); the lower shell (12) is provided with a plurality of tuning holes (121); and the lower shell (12) is provided with a first tuning paper (122) covering each tuning hole (121); a fixed spring sheet (3) is provided inside the shell, and the upper surface of the fixed spring sheet (3) is covered with a second tuning paper (4); the fixed spring sheet (3) divides the inner cavity of the shell into two chambers, one of which is formed by enclosing the fixed spring sheet (3) and the lower shell (12), and is a tuning chamber (5); and the other chamber is formed by enclosing the fixed spring sheet (3) and the upper shell (11), and is a pressure relief chamber (6); The speaker body (2) is fixed to the lower end of the fixed spring sheet (3), a vibration plate (21) is provided on the speaker body (2), and a through hole for the vibration plate (21) to pass through is provided on the fixed spring sheet (3) and the second tuning paper (4), and the vibration plate (21) is fixedly connected to the upper half shell (11) after passing through the through holes on the fixed spring sheet (3) and the second tuning paper (4).

2. A vibration speaker according to claim 1, characterized in that: The number of the first tuning papers (122) is consistent with the number of the tuning holes (121), and each piece of the first tuning paper (122) covers one tuning hole (121).

Images